Stem leaf diagram marks test for group of students | ||
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5 6 7 8 |
4 6 7 7 7 9 2 3 4 0 2 3 4 6 2 3 4 5 7 9 |
key; 5|4 = 54% |

(a) the mark for the top student has
been left out range for complete class of 20 students was 35 calculate the mark for the top student, insert into table |
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range = 35 + 54 = 89 or = 89 - 35 = 54 |
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(b)what was the mean for the lowest
4 marks? 54 + 56 + 57+ 57 = 224 ÷ 4 = 56 or (4 + 6 + 7 + 7 )÷ 4 = 6 |
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(c) top 15% of all students in the
class awarded A* grade what was the lowest mark in A* grade? 15% of 20 students = 15 100 --- X ----- = 75% = 3 students 20 1 8 |2 3 4 5 7 9
score at least 85% |